Behavioural and electrophysiological responses of grape berry moth (Lep., Tortricidae) to selected plant extracts
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Date
2006
Journal Title
Journal ISSN
Volume Title
Publisher
Blackwell Verlag, Berlin
Abstract
Four non-host plant extracts from Bifora radians, Arctium lappa, Humulus lupulus and Xanthium strumarium, were tested against adult grape berry moths, Paralobesia viteana, for their potential as repellents or oviposition deterrents. Responses were compared with those elicited by the major component of the P. viteana sex pheromone.
Moths of both sexes exhibited varying electroantennogram (EAG) responses from 1.7 to 2.4 mV to volatile odours
from plant extracts, with the greatest response to extracts of H. lupulus(2.4 mV). A multi-arm olfactometer was used to assay the behavioural response of moths to the same treatments. Male moths responded significantly to H. lupulus extract, although their strongest response was to the sex pheromone (30.0%). Female moths showed no behavioural response to the sex pheromone, attracting only 6.7% of moths, but they were attracted to extracts of H. lupulus, X. strumarium and A. lappa, with 25.0%, 21.7% and 15.0% of the released insects responding to these treatments, respectively. Choice tests were conducted to compare oviposition by P. viteana on untreated grapes and on grapes
treated with one of the extracts. Despite the attraction in the olfactometer assays, H. lupulus extract significantly reduced egg laying; only 12.5% of the total deposited eggs were laid on berries treated with this extract. The extract of B. radians provided complete protection against oviposition
Description
Keywords
Paralobesia viteana, behaviour, deterrent, pesticide alternative, plant extract
Citation
J. Appl. Entomol. 130(9-10), 509-514